Casio CTK-680, Service Manual

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CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SPECIFICATIONS
GENERAL
Model: CASIO CTK-680
Keyboard: 61-key, 5-octave standard size keyboard with touch response (three sensi-
tivity levels and OFF setting)
Tones: 128 tones (Conform with General MIDI level 1) + 8 drum sounds with split/
layer features.
Polyphony: 32 notes maximum
Digital effects: 10
REVERB 1, REVERB 2, REVERB 3, CHORUS, TREMOLO, PHASE
SHIFTER, ORGAN SPEAKER, ENHANCER, FLANGER, LOUDNESS
Musical pads: 120 (four pads
×
30 sets)
Phrases (22 sets), drums/percussion (7 sets), controller (1 set)
Phrases matche chord
Demo tunes: 3, sequential repeat playback
Auto-accompaniment
Rhythm patterns: 100
Tempo: Adjustable (216 levels,
q
= 40 to 255)
Chords: 3 types (CASIO Chords, Fingered, Full-Range Chords)
Parts: Rhythm, bass, Chord 1, Chord 2, Chord 3 (adjustable on/off, tone, volume,
pan, effect send, fine tune, coarse tune, expression settings)
Others: Intro, Normal Fill-in, Variation Fill-in, Synchro/Ending
Magical presets: 50 types (Break Beat, Melodycomp, Shadow Drum, Free Session)
Registration memory: 10
Tone changes, tempo setting, auto-accompaniment volume setting, mode,
layer on/off, Mixer settings, effect type, split on/off, rhythm type, auto-
accompaniment rhythm assignment, pad type, chord fingering method,
touch response setting, MIDI settings (including assignable jack settings),
Magical Preset type
Mixer
Number of channels: 16
Parameters: TONE, VOLUME, PAN, EFFECT SEND, FINE TUNE, COARSE TUNE,
EXPRESSION
Multi-track memory
Number of songs: 2
Tracks: 6 (tone, volume, auto accompaniment, magical presets, pan, effect send, fine
tune, coarse tune, expression)
Type: Real-time
Capacity: Approximately 5,200 notes